Low-order lines of data bus with 3-state, Bi-directinal function foe use in dataTransaction with the MPU. These lines are Not used when interfacing with a 4-bit Microprocessor.

13-16

DB4-DB7

Input/output

MPU

High-order lines of data bus with 3-state, Bi-directional function for use in dataTransactions with the MPU. DB7 may alsoBe used to check the busy flag.

17

NC

18

Contrast adjust

VDD-Vo:LCD DRIVING VOLTAGE

VR:10K~20K

DC Electrical Characteristics

Parameter

Symbol

Conditions

Min.

Type

Max.

Unit

Supply voltage for LCD

VDD－VO

TA=25℃

—

4.6

—

V

Input voltage

VDD

3.0

—

5.5

V

Supply current

IDD

VDD=5.0V;TA=25℃

—

—

1.5

mA

Input leakage current

ILKG

—

—

1.0

μA

“H” level input voltage

VIH

2.2

—

VDD

V

“L” level input ;voltage

VIL

Twice initial value or less

0

—

0.6

V

“H” level output voltage

VOH

LOH=0.25mA

2.4

—

—

V

“L” level output voltage

VOL

LOL=1.6mA

—

—

0.4

V

Optical Characteristics

For STN Type Display Module (Ta=25℃, VDD=5.0V±0.25V)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Viewing angle

θ

Cr≥2

-60

－

35

deg

Φ

-40

－

40

Contrast ratio

Cr

－

6

－

－

Response time(rise)

Tr

－

－

150

250

ms

Response time(fall)

Tr

－

－

150

250

ms

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FAQ

1. How to RESET (E2H)?

A0

E (RD)

R/W (/WR)

D7

D6

D5

D4

D3

D2

D1

D0

0

1

0

1

1

1

0

1

1

1

0

This command clears

The display start line register.

And set page address register to 3 page.

It does not affect the contents of the display data RAM.

When the power supply is turned on, a Reset signal is entered in the RES pin. The Reset command cannot be used instead of this Reset signal.

2.What is 8 bits parallel interface ?

In data transmission, parallel communication is a method of conveying multiple binary digits (bits) simultaneously. It contrasts with serial communication, which conveys only a single bit at a time; this distinction is one way of characterizing a communications link.

3.What is the difference between a parallel and a serial communication channel ?

The basic difference between a parallel and a serial communication channel is the number of electrical conductors used at the physical layer to convey bits. Parallel communication implies more than one such conductor. For example, an 8-bit parallel channel will convey eight bits (or a byte) simultaneously, whereas a serial channel would convey those same bits sequentially, one at a time. If both channels operated at the same clock speed, the parallel channel would be eight times faster. A parallel channel may have additional conductors for other signals, such as a clock signal to pace the flow of data, a signal to control the direction of data flow, and handshaking signals.

4.What is the application of parallel communication ?

Parallel communication is and always has been widely used within integrated circuits, in peripheral buses, and in memory devices such as RAM. Computer system buses, on the other hand, have evolved over time: parallel communication was commonly used in earlier system buses,